Malicious PDF — malware analysis report

Static analysis result for SHA-256 1610547217c9acb6…

MALICIOUS

PDF

35.9 KB Created: 2021-07-03 13:22:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 4b4c821b2f6a48f792986b321ea19749 SHA-1: e79a39a7819bd477e3df58c7de04f66ee5ec3e44 SHA-256: 1610547217c9acb6bc4e1d0a99934b3dc6909133fc9e50855e3f11cfea7dd16d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one to a known malicious redirector at http://netcdn.tw/app/406889139/free-coin-master-s-game-hack. The document body and embedded links suggest a lure for game hacks and generators, which is a common tactic for distributing malware or leading users to phishing sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://netcdn.tw/app/406889139/free-coin-master-s-game-hack In PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/how-do-you-hack-through-walls-in-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/roblox-arsenal-hack_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/how-to-get-free-robux-gift-cards_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/is-windows-10-minecraft-free_GM479516143.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/free-robux-no-anti-bot-verification_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/cheat-roblox-jailbreak-noclip_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/free-robux-generators-without-doing-gift-cards_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/free-robux-generator-codes_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/coin-master-hack-tool-v1-9-download-free-pc_GM406889139.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/flamethrower-hack-roblox_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/cheats-for-egg-farm-simulator-roblox_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/roblox-prison-life-hack_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/coin-master-time-speed-hack_GM406889139.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/roblox-btools-cheat-engine_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/coin-master-hacks-for-iphone_GM406889139.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/free-cute-roblox-tops_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/free-coin-master-spins-blog_GM406889139.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/how-to-get-free-robux-without-verifying-2021_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/coin-master-time-hack-ios_GM406889139.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/coin-master-free-spins-hack-iphone_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003762.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3762 22884 bytes
SHA-256: 83f1e7c3a72c99ebc60ca7006cc339029279753129561b4b7c376a7bb335f91e
font_01_sfnt_off00006ad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AD1 17996 bytes
SHA-256: e73ad1949997423a3d5b1ae8c404e3daaf550eb6d6e5d8735e8b2899a6b2b9df

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